/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String input = "\u0000Dog\u0000Cat\u0000" ;
		int lengthBefore = input.length();
		String modified = input.replace( "\u0000" , "" ) ;
		int lengthAfter = modified.length();
 
		System.out.println( "lengthBefore = " + lengthBefore );
		System.out.println( "lengthAfter = " + lengthAfter );
	}
}

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